﻿using System;
using System.Windows;
using System.Windows.Data;

namespace AppToolkit.WPF.UI.Converters
{

    /// <summary>
    /// Converts between bool? and <see cref="Visibility"/>
    /// </summary>
    public class VisibilityConverter : IValueConverter
    {
        #region IValueConverter Members

        /// <summary>
        /// Converts a value. 
        /// </summary>
        /// <returns>
        /// A converted value. If the method returns null, the valid null value is used.
        /// </returns>
        /// <param name="value">The value produced by the binding source.</param><param name="targetType">The type of the binding target property.</param><param name="parameter">The converter parameter to use.</param><param name="culture">The culture to use in the converter.</param>
        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            var visible = value as bool?;
            if (visible.HasValue)
            {
                if (visible.Value)
                {
                    return System.Windows.Visibility.Visible;
                }
                return System.Windows.Visibility.Collapsed;
            }
            return null;
        }

        /// <summary>
        /// Converts a value. 
        /// </summary>
        /// <returns>
        /// A converted value. If the method returns null, the valid null value is used.
        /// </returns>
        /// <param name="value">The value that is produced by the binding target.</param><param name="targetType">The type to convert to.</param><param name="parameter">The converter parameter to use.</param><param name="culture">The culture to use in the converter.</param>
        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            throw new NotImplementedException();
        }

        #endregion
    }
}
